<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let arr = [1,5,7,2,12,85,7,8,56,78,9,97,8,54,31];
        for(let i = 0 ; i <arr.length; i++){
            for(let j = 0 ; j < arr.length-1 ; j++){
                if(arr[j]>arr[j+1]){
                    [arr[j],arr[j+1]] = [arr[j+1],arr[j]]
                }
            }
        }
        console.log(arr);
        
    </script>
</body>
</html>